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JOURNAL ARTICLES
Exposure to retinoic acid before or after the onset of somitogenesis reveals separate effects on rhombomeric segmentation and 3′ HoxB gene expression domains
H. Wood, G. Pall, G. Morriss-Kay
Development 1994 120: 2279-2285;

Summary

We have compared the relationship between the patterns of altered morphogenesis and of altered gene expression in mouse embryos exposed to excess retinoic acid (RA) (a) just before and (b) just after the onset of somitic segmentation (day 7.75 to day 8.25). Exposure to RA prior to the onset of somitic segmentation results in suppression of rhombomeric (but not somitic) segmentation, and conversion of the genetic identity of the whole preotic hindbrain to that of rhombomere 4. In contrast, exposure to RA at early somite stages results in near-normal rhombomeric segmentation; rhombomeric gene expression domains indicate that only rhombomere 2 has changed its genetic identity to that of rhombomere 4, the other preotic segments showing normal expression patterns for HoxB genes and Krox-20. The results indicate that RA has separable effects (1) on the genes mediating the process of rhombomeric segmentation per se, such as Krox-20, and (2) on the genes that influence the nature of the structures that subsequently develop from the individual rhombomeres, such as the Hox genes.

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JOURNAL ARTICLES
Exposure to retinoic acid before or after the onset of somitogenesis reveals separate effects on rhombomeric segmentation and 3′ HoxB gene expression domains
H. Wood, G. Pall, G. Morriss-Kay
Development 1994 120: 2279-2285;
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